All the Orthodox I know are very aware of the presence and the protection of their holy Guardian Angel and besides the regular Prayerbook prayers at morning and evening they pray to them during the day, to ask for help with an approaching problem or danger and to thank them when the danger is past.
A popular book is "The Holy Angels" by Mother Alexandra
. This covers the work of angels in the Old and New Testaments, their place in tradition and in the Liturgy and their work of protecting and guiding the souls to whom God assigns them.
"The Holy Angels" should be in your church library.http://www.amazon.com/exec/obidos/ASIN/0932506100/holytrinity-20/002-7139132-1181654
"This book is a well-researched study of the Holy Angels from both the Eastern and Western Christian perspectives. Mother Alexandra's study begins with angels as presented in the Pentateuch and looks at them throughout the Prophets, the New Testament, and Church history. It also looks at how angels have been imaged throughout the ages in Orthodox iconography as well as Western Christian art. This study was prompted when Mother Alexandra was a young girl and actually saw her Guardian Angel. Before Mother Alexandra died, I was blessed to hear her speak about this experience. She writes about this experience in her book. "I'm as sure of it now as I was then," she says. I would recommend this book for anyone interested in learning more about angels and their purpose both in Heaven and on earth."
The Princess Ileana was born, Baptized, and Christmated in 1909 in Bucharest, Romania, the youngest daughter of King Ferdinand and Queen Marie. She lived through WWI, and soon followed the example of her mother in works of charity. At the age of 22, she married Archduke Anton of Austria, with whom she had six children. In March 1944, she moved her family back to Castle Bran in Romania to escape Nazi oppression during WWII. There she built a hospital in honor of her mother before moving her family to Argentina, then the United States. When her children were grown, through college, and married, Princess Ileana devoted her life to God by becoming a nun. Mother Alexandra served as abbess of the Orthodox Monastery of the Transfiguration in Ellwood City, PA, until her repose in the Lord in 1991.
Mother Alexandra was blessed to actually see her guardian angel as a child - the angel who would protect and guide her throughout her difficult but faithful life.